CVE-2014-3509

Condición de carrera en la función ssl_parse_serverhello_tlsext en t1_lib.c en OpenSSL 1.0.0 anterior a 1.0.0n y 1.0.1 anterior a 1.0.1i, cuando multihilos y la redención de la sesión están utilizados, permite a servidores SSL remotos causar una denegación de servicio (sobrescritura de memoria y caída de la aplicación del cliente) o posiblemente tener otro impacto no especificado mediante el envió de datos Elliptic Curve (EC) Supported Point Formats Extension.

A race condition was found in the way OpenSSL handled ServerHello messages with an included Supported EC Point Format extension. A malicious server could possibly use this flaw to cause a multi-threaded TLS/SSL client using OpenSSL to write into freed memory, causing the client to crash or execute arbitrary code.

A flaw in OBJ_obj2txt may cause pretty printing functions such as X509_name_oneline, X509_name_print_ex et al. to leak some information from the stack. Applications may be affected if they echo pretty printing output to the attacker. OpenSSL SSL/TLS clients and servers themselves are not affected. If a multithreaded client connects to a malicious server using a resumed session and the server sends an ec point format extension it could write up to 255 bytes to freed memory. An attacker can force an error condition which causes openssl to crash whilst processing DTLS packets due to memory being freed twice. This can be exploited through a Denial of Service attack. An attacker can force openssl to consume large amounts of memory whilst processing DTLS handshake messages. This can be exploited through a Denial of Service attack. By sending carefully crafted DTLS packets an attacker could cause openssl to leak memory. This can be exploited through a Denial of Service attack. OpenSSL DTLS clients enabling anonymous DH ciphersuites are subject to a denial of service attack. A malicious server can crash the client with a null pointer dereference by specifying an anonymous DH ciphersuite and sending carefully crafted handshake messages. The updated packages have been upgraded to the 1.0.0n version where these security flaws has been fixed.